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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dacdb5fc423d4e8801b9c9bb337ffcc3621efe9b685f6d1c67b2271408ab2fb3' 
  AND token = 'HlY/b/IiaR21CZRliW/DRrIgJaO/n2Rk6xlA1k3BePo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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