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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e6a8d2c8a670522c6af3f74d3305979d7d21e9e14d615b0db56ffaef69c13d' 
  AND token = 'uUdd0DEbH/DgHIQ6+PLdBGEx5VoNmU0jobKxhVeOZ9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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