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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ff5011c4661923f9ec1de5179d0ef65bc30f4348df7afaa736be4f1021356d' 
  AND token = '/a1glOARUz6tCJGUKZwRQSW5ZzJtuqF09VcPU04E9cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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