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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964ebfff14acfdcd9c7c08bceceef576e73b7a57724a5c9afd17dd0b73905e1c' 
  AND token = 'kWlgHGPK6cuTL7C8NjzFVpAhAi4cEQccbxcYYbOawjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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