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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c8c65c54fee1ad5027a380ce28361e353ed53a3cd7e8e8fad63eff1e727ad30' 
  AND token = '5TE9gEE0PuGW3capqWQBwkbWVaAlvKe4M0w59PQ1510=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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