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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb269ceebaf3bd05d4c3b554623c5a88475e2a3dff198517d31d9e94dcaae1a' 
  AND token = 'N/03+R3WnjU8OanEgKW2Jg//I0Oo2QWCM69eBJWg2Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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