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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad92aac595c1be8f5be7a03645f51f673a63619eb6284d192ceb15b1f003bb80' 
  AND token = 'PZIc2g3q5Cm88b/SUVz1HyW4VfzinIL4Bh7Ku7gadng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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