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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c0982309aa44eab089f67997d9299f9b324afaa6d849f49b706ee9c75171b1' 
  AND token = 'xKrwe0AUNz2G+xKdyhMERAIf97XNFYAnFGB5RbU6coQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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