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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7814ddc065ed61bec04ae15061f320280aa1d1e218c4ad12765f98837c9bddd' 
  AND token = 'J14RRILL1e9jfsdF51JQyXFxlzL5I7Q4xCGhZanQeoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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