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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd8b1846c96dfc033a10eed4c7c6524a37d706ac399b5bfd82d8aab30ac3bf9' 
  AND token = 'pFbdTLoDFpOmiDr8N6soRf/boI/GK0fLU0vSxfec+0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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