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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2efd7c082099248bb7f675979efb71d7689a4583c42020b4197b45dc297d17e9' 
  AND token = 'LMCZH/xhdT0zzE4BSnyCvVeDBFCkJTE7Gsq7HC6Mvyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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