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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb9f77e97135e6956402c558e9da7f982cc087a081503a823840c11c4634751' 
  AND token = 'Xh9UMcQ3y+g1X1DakSR62grWogfcibcZpUzV7KsMavg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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