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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e8b9b02ebc3d12292319a77fa1e9c89dac744e3201d840079efd9d40a23723' 
  AND token = 'SIt9BVX6sW+HRleQeARYeZtaMsHQyBH2TmvMGt478ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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