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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3d07051cac1d607fc98188174675126b2349eea832dc1d53751f85646c0e98' 
  AND token = '9mkwua5JtWHBdmiQN3sHpsoPB7YSXpY23Idr93odRe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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