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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb707ca4f3f8f40042cdc3b6c875335464292fabfc70d9f5e51d292537265b94' 
  AND token = 'o9GXp0XLvvwr3noGAdMVq5C9St6zeRJCAgVTQNL7Lj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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