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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1897276d818e8d1bbd5e2937838e05049567e8c77aa9022f7d232a39d5fa591' 
  AND token = 'rjjc7KPIJe3Qs3FTF32ooSUGhQXQtnYWG6tL9B9GZbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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