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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4dd75850c681d912be974045af9bd743faf167135d119845e732c75df152191' 
  AND token = 'wH9/z+H5HTs9oiv+cOS61T5SebAmkIij0KHZvvhkFlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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