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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a270e12cb01a5552d51281ae1ad8cd814c998e539e698b8c2d5a2b42774f0a11' 
  AND token = 'xjmKkMua6M8k5HpOIvVBEVnIjuSni/Emilfg3V8kCUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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