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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335f584a3a18dc92f2904f4c1440e8ce4cc94946a01a47c56b361221c20ee24e' 
  AND token = '1BCtdf0H4nx7UlMyqN8OJSyAStny+VSUh8OMgouXYmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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