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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e1e2f19b523cd5bea478414644375782af69ebe883a5bee8d5c5ca6a51596c8' 
  AND token = '9G4N8GkNYt7JXXzeY5CK7mNRvHBAtkkgqho/9MhQGE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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