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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37cdf707d5271b192d3d83a0a318a614321a4541ba8056a9349a4710d9bcea9' 
  AND token = '/cxy2elndMiENpS3xU3yEA3X089wWwokU3U2eW9qqDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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