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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb95cf3a2605e5f6016cd3dd1d4c7973fb624b964a4e5a06efaefb3614109033' 
  AND token = 'lg11CCeliIibHc25dQ/NVMx1LtdoAXga+weibnl9y3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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