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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2b8eeaee5dd4547a75fac51bf71a203874d945ec27a3ea6b75d0bf762b935e' 
  AND token = 'Vo/360A2mcbwy2y8WVM0zhFnIgD4ogXag40fYj6Lfls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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