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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18ba17e653d495ed8ab8f226966dcd7790ba706e68b74ca1672d3c4bf1b6ec7' 
  AND token = 'w7z5y7MDSuCnXcr3twb/m7943q+PPk3RLqfwuF5wvh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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