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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f5b75bc645b7f58bcce0744a769446bca3088870c49f5a0bca6230dce0f52d4' 
  AND token = 'QmTqRH5vtWanRSegvXnKYIQj3I8LL9WtdSqrx9XTGdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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