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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b411344c8c43ff2c7d556907aff5eee889e1aa0c4464a1799ef9fe84ff5414' 
  AND token = 'V7fVgohf0rKIvUh2nrIXgptPMPExOf5SKoCOJW1Usho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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