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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cfd1feb5cdd21fac78e2e7745add46ecad7870a13b438664e3d7e66cc5ab19e' 
  AND token = 'Gc25Nr7YNhVgDF9sfcZZeFiY3eMkEaj/QX5Mw/FgJUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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