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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23a51c8b3c0a07e5ef96a5c039129bd0d60b3d2e4bd1b192ce96cd159dc50e4' 
  AND token = 'KJwwtSoErBE9cfHzQxQke8rcGHw572NiFgsOibJV2IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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