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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df25522c58957bd77e3697b23b86dff637424d8b5079ca6d5e6523ed9bb07f1f' 
  AND token = 'rdAZ+QUyr2n8oj9FC5VUGjEx3D5MatzFrT7Y7WAOoUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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