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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e9f0f5e1ea4ae6c6d34044ed83550cc79bd2fed0546dac638bdfb003bfa499a' 
  AND token = 'VwxY7faPPVlFi0ybEgknJKry49kh2/hIlN5BzBg/rE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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