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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06176f5548aada63acb2e315ab6a6230c1ebddef9aafb7bdf4483249291d9514' 
  AND token = '2VISIorZEaHPMg8kCtgQJXM0wR2cMpXW/QbAOSOs0nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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