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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1fedecd03b91922a0826f63acbec69441c1f78ba49e45d7cb1e41800325647f' 
  AND token = 'MAnLsG+h2kWt2Qmtwq5trwD6Dyt2JHZQBzIlDiM70PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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