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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d8fa8a6f73e0dbd7899f3d5830c1c1b96fd813e975cf9f1378afbc9ae0287e' 
  AND token = 'MkFoTnGcPSwyTY2ARw7D6c+EnlPoLlOi4lg85mY197k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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