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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc8c281bf2d1cc25519e7bac1db155b1b1473ae16606402b15e48318d5debcc' 
  AND token = '3dB/5U/3n5zN+wkhpaTFqZ2eENzM7Orws4R8gkvEv68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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