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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c257095c8996fd988f7d9bcbe57eadbb9891769443a7a068cc49d70495cbb1e' 
  AND token = 'SrKGacV2D2KsL2sBU+8wPJUOg1q57P6isD2MQFa1kSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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