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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89fa7aa7aa5699ad237a5035c7bfd963a2bc78fed93bcd615ea47392dd6b4525' 
  AND token = 'sPv/lAcukU3gmXA3HAjvcFPpbHyBB635C8MBi/9JZ4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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