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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '612b71b914400218968727d1f21aaee76bf7181dbd80133c6bfcc52bd4fc9ba0' 
  AND token = 'ifGbjUSkoY/8w86YLqQO+sz1LcILWo8+12l5A9b2bAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}