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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62308e3c1e723c04c0c172f43dafb9797085db79c446f2f4b98fcb1cf17bcd57' 
  AND token = 'Wz5DVpfMfy+PfvuwgH8KCSom4ZcYHctZUs4dDTov6r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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