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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c2dc9b05d14d7526c1aaf0a8d0268a5c4cd5d2fed8f8c7712a5dd6224d32497' 
  AND token = 'Q9fTHFkyLZC579X+vRVZIji4S1dinIzAnClOg8Un3Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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