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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7102adb4d5941ea1953f6fdf53e4b8b2f5e61584750e45bb24fcba0af3b1d50c' 
  AND token = 'U9zZA9S3qvYyyzFnX+0l2WuRTyr5/XRF7SPdOInwG04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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