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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9a3caef011ab2101b2e15ff4943c088515c1a4a9b992b9a3fe8892edbf4bf6' 
  AND token = '9M2KnNnsubCGTNI2S/ygXb8jQQ2Ie7J5rhPU1K8Nz2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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