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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34aeb0f91eab97482a8186a73689c4361dbe79a23b88b41b4d936d3a678b3e83' 
  AND token = 'jxsgfjh1N3aLw8OuAqEsoeDQgl/5gbpKRgeJcuUCTlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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