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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079012927cd0b34ecd0a4740ede1389a79e8c08024aea9112482fe5337caef46' 
  AND token = 'wO3U6WPceeIipo9Hsn1SooGvV+V0rp5LDsuRHH5EXCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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