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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ebe94f2057f207df9aa96f8db48d0021fd7d75afeb81e90ce1dd50a85595b66' 
  AND token = '8QrskyM5Kc3LQodYvx5g8NP/Kdx6qcdjMTqK3tXU8bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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