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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3221521cfc144d7db1459805c1d241cda597de1848d32a125819671a11b543b5' 
  AND token = '7re1EDU0YpE3DwpKQzI61Ff7t1bPzT1RULPeBGl9duU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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