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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04385d3c425dc9b35e814d51f7143d75b0ecfbd3ab152edfeb94aff7649e3140' 
  AND token = 'heKo3jTEAa2J5S2UCBmY5oEXiNY9ehndOfS8bcYbO2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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