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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be87bce61f4d933309239f0259dace400509665abf7a91030e937e7a19de6669' 
  AND token = 'm/dDEGIyYjWe1Fg7pVRPCcvjkO3Y4k6fno8f1ZwE+NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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