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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9057a300bdb4074b01cb5ef9098d495fcf7c4956911120f3ec8e8c39dd6944' 
  AND token = '7ryNLkc4wA4VbOVGgXTwiJhMJy6vOanUCAb8N8V6v40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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