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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b3ae7811c68e1dbe046aa37f809e3d017c416f12884b503e725503863d2bca' 
  AND token = 'eA/FIQnCAyPeDbaMDSBEs0/Vf5VPw77Nomzls14qkbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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