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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308a359ffedc55b43cd176e1133d44328a5b95cdad8c3c173ba9c47de529438f' 
  AND token = 'xScOD3/aQ2SOyyAUp895wZU+nOk/La+nFwvPqfSnLRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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