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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca42afb8c30a71c05eb4d7947411189b4a747b1dc66f8bd99796e512c43bc263' 
  AND token = 's7v9V/aUUSR7CVGuE70tA+TffwPO/1WYKpQ99fJafVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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