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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a039410c7d2eb3e2a558d558752b6e13955d7d978110b493b9b3fd841f4d18' 
  AND token = 'qTdwWlqlqgnhZVEiIE7Aa1Yr/lN6bCEvRe3Rf0eOvMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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