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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aac5b46955df2ff2b0c2051ccaf0818b6c4cf2a0d73abdd3563a791bff6d85d' 
  AND token = 'wGIi9SFxyqYVg5Jmeyw/DVFf1wWhI3PA3+nARItDuiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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