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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12f76e792007d8cf877716a0293f2d8304b46c7259d6e9d4feede18da027171' 
  AND token = 'oNo/+cXaxveM7POA6OuOn4caa6r6jEsuqZBtc+DPxNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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