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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '525260688cc4db8cd3907a8b3651b6e5bce56375c945405377ebdb049be1f7b7' 
  AND token = 'sYuq6eVPCePiPFCamCi0FQn2tYHnEvESnIa0uM9l33o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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