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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8a4a452bd3bad5d978e0ecf9a4d3f5f45a2091b97a06afebe78ef8de5e6d25' 
  AND token = 'PCwJE6PQ1l+l5i4HfBXZvJh/m/1PJAoHdJozuw48pR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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