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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47ea3c657126dea575e6aab441e40651307285582b47e0d05855df3960b1948' 
  AND token = '3WLxr8a4SOY39Jczggyrr2Um9yku0E/EO/GV1VCktZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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