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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1ad0c8fd410dff6bf2594148abec50169aab02b6ee6269ec8980b2245eef78' 
  AND token = 'Ogh+C5dFLFB5TX9a0yCzInqcl0Hmk7+kh25fH6TfWLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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