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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e26f1383b01ea3af11d93075f5b830f462dfb7b5a40256ccf60648fa593e7eb' 
  AND token = 'CPQ7N6ODjG+MGTCvFEJFcNYEytitufWlqGoWlspnlbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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