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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a0a8e1c4aa4505f8f31f5ba5b34dec26e6b0cf8eb766f3f34cb5fd6ce3c45bd' 
  AND token = 'hbgKHLI0CpP2om0vWIYlEQYhyBHFd8aOWT44BFtzYeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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